Еп. 343: Naruto confronts Tobi while Kakashi and Guy react to the revelation of his true identity as Obito.

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Naruto attacks Tobi in Tailed Beast Mode while Kakashi and Guy look on, the former initially hesitant to join the fray over disbelief of the masked man's identity before Guy snaps him out of it. Tobi unleashes a shower of gigantic chakra receivers, paralyzing B and Gyuuki. Naruto creates a shadow clone that charges forward with a Rasengan before suddenly disappearing while the original prepares a Tailed Beast Ball with B and Gyuuki acting as a shield. Tobi escapes the Naruto's Tailed Beast Ball, but realizes too late that Kakashi sent the clone to the other dimension as the Rasengan shatters his mask, the Naruto clone shouting, "Who are you?!". Kakashi and Guy are shocked to find the masked man to be their former comrade Obito Uchiha, a student of Minato's who was alongside Kakashi and Rin Nohara was a member of their team before Obito was thought to have died during the efforts to destroy the Kannabi Bridge which occurred during the Third Great Ninja War at Kannabi Bridge as flashbacks show young Obito entering the Academy and befriending Rin and developing a rivalry with Kakashi as well as his promotion to Chunin with his classmates being Asuma, Kurenai and Might Guy and the mission that saw Kakashi lose the sight in his left eye before he inherited Obito's Sharigan with the mission ending with Obito's presumed death. In the present, Guy informs Naruto of their opponent's true identity while Kakashi is devastated that Obito faked his death with Obito revealing that he knew Kakashi failed to protect Rin as promised which has Kakashi stunned. Naruto motivates a devastated Kakashi that Obito needs to be stopped before intercepting his Fire Style: Bomb Blast Dance with Kurama's tails. Just then, Madara appears alongside Obito to the others' surprise. (Source: Wikipedia) Fourth Shinobi World War: Climax arc: (22/41)